me.tfeng.play.avro.JsonIpcController.java Source code

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Here is the source code for me.tfeng.play.avro.JsonIpcController.java

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/**
 * Copyright 2014 Thomas Feng
 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package me.tfeng.play.avro;

import java.io.ByteArrayInputStream;
import java.io.IOException;

import org.apache.avro.Protocol;
import org.apache.avro.Protocol.Message;
import org.apache.avro.Schema;
import org.apache.avro.io.DecoderFactory;
import org.apache.avro.ipc.Responder;
import org.apache.avro.ipc.specific.SpecificResponder;
import org.apache.commons.lang3.ArrayUtils;
import org.apache.http.entity.ContentType;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.context.SecurityContextHolder;

import com.fasterxml.jackson.databind.JsonNode;

import me.tfeng.play.common.Constants;
import me.tfeng.play.plugins.AvroPlugin;
import play.Logger;
import play.Logger.ALogger;
import play.Play;
import play.libs.F.Promise;
import play.libs.Json;
import play.mvc.BodyParser;
import play.mvc.Controller;
import play.mvc.Result;
import play.mvc.Results;

/**
 * @author Thomas Feng (huining.feng@gmail.com)
 */
public class JsonIpcController extends Controller {

    public static final String CONTENT_TYPE = "avro/json";

    private static final ALogger LOG = Logger.of(JsonIpcController.class);

    @BodyParser.Of(BodyParser.Raw.class)
    public static Promise<Result> post(String message, String protocol) throws Throwable {
        String contentTypeHeader = request().getHeader("content-type");
        ContentType contentType = ContentType.parse(contentTypeHeader);
        if (!CONTENT_TYPE.equals(contentType.getMimeType())) {
            throw new RuntimeException(
                    "Unable to handle content-type " + contentType + "; " + CONTENT_TYPE + " is expected");
        }

        AvroPlugin plugin = AvroPlugin.getInstance();

        Class<?> protocolClass = Play.application().classloader().loadClass(protocol);
        Object implementation = plugin.getProtocolImplementations().get(protocolClass);
        Protocol avroProtocol = AvroHelper.getProtocol(protocolClass);
        Message avroMessage = avroProtocol.getMessages().get(message);
        byte[] bytes = request().body().asRaw().asBytes();
        SpecificResponder responder = new SpecificResponder(protocolClass, implementation);
        Object request = getRequest(responder, avroMessage, bytes);
        if (AvroHelper.isAvroClient(protocolClass)) {
            Promise<?> promise = (Promise<?>) responder.respond(avroMessage, request);
            return promise.<Result>map(result -> Results.ok(AvroHelper.toJson(avroMessage.getResponse(), result)))
                    .recover(e -> {
                        try {
                            LOG.warn("Exception thrown while processing request; returning bad request", e);
                            return Results.badRequest(AvroHelper.toJson(avroMessage.getErrors(), e));
                        } catch (Exception e2) {
                            throw e;
                        }
                    });
        } else {
            Authentication authentication = SecurityContextHolder.getContext().getAuthentication();
            return Promise.promise(() -> {
                Authentication currentAuthentication = SecurityContextHolder.getContext().getAuthentication();
                SecurityContextHolder.getContext().setAuthentication(authentication);
                try {
                    Object result = responder.respond(avroMessage, request);
                    return Results.ok(AvroHelper.toJson(avroMessage.getResponse(), result));
                } catch (Exception e) {
                    try {
                        LOG.warn("Exception thrown while processing request; returning bad request", e);
                        return Results.badRequest(AvroHelper.toJson(avroMessage.getErrors(), e));
                    } catch (Exception e2) {
                        throw e;
                    }
                } finally {
                    SecurityContextHolder.getContext().setAuthentication(currentAuthentication);
                }
            }, AvroPlugin.getInstance().getExecutionContext());
        }
    }

    private static Object getRequest(Responder responder, Message message, byte[] data) throws IOException {
        Schema schema = message.getRequest();
        if (ArrayUtils.isEmpty(data)) {
            // The method takes no argument; use empty data.
            data = "{}".getBytes(Constants.UTF8);
        }
        JsonNode node = Json.parse(new ByteArrayInputStream(data));
        node = AvroHelper.convertFromSimpleRecord(schema, node);
        return responder.readRequest(message.getRequest(), message.getRequest(),
                DecoderFactory.get().jsonDecoder(schema, node.toString()));
    }
}